Gradient Distribution of Root Exudates and Polycyclic Aromatic Hydrocarbons in Rhizosphere Soil

2011 ◽  
Vol 75 (5) ◽  
pp. 1694-1703 ◽  
Author(s):  
Yanzheng Gao ◽  
Yan Yang ◽  
Wanting Ling ◽  
Huoliang Kong ◽  
Xuezhu Zhu
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Root Exudates ◽  
Aromatic Hydrocarbons ◽  
Rhizosphere Soil ◽  
Gradient Distribution ◽  
Polycyclic Aromatic

scholarly journals Enhanced rhizodegradation of polycyclic aromatic hydrocarbons in corn straw-amended soil related to changing of bacterial community and functional gene expression

2021 ◽  
Author(s):  
Huanyu Bao ◽  
Jinfeng Wang ◽  
He Zhang ◽  
Jiao Li ◽  
Fuyong Wu
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Citric Acid ◽  
Bacterial Community ◽  
Root Exudates ◽  
Aromatic Hydrocarbons ◽  
Contaminated Soil ◽  
Corn Straw ◽  
Combined Application ◽  
Polycyclic Aromatic ◽  
Amended Soil

Abstract Root exudates can stimulate microbial degradation in rhizosphere, but it remains unclear whether the rhizodegradation of polycyclic aromatic hydrocarbons (PAHs) occurs in corn straw-amended soil. Hence, in the present study, either citric acid, a common low molecular weight organic acid in the root exudates, or corn straw was added into aged PAHs-contaminated soil to investigate their effectiveness in the biodegradation of PAHs. The present study showed that either corn straw (Y) or combined application of corn straw and citric acid (YN100) significantly (P < 0.05) enhanced the degradation of total PAHs in soil after 28 days incubation, which increased by 8.43% and 18.62% compared with control (CK), respectively. High-throughput sequencing suggested that both Y and YN100 treatments led to a shift in bacterial community in soil and increased the abundance of PAHs degraders. Interestingly, the copies of PAHs ring-hydroxylating-dioxygenase (PAH-RHD) Gram-negative bacteria (GN) genes under YN100 treatment was significantly (P < 0.05) higher than those under Y treatment in the soil. Network analysis showed that the potential hosts of PAH-RHDα genes were Lysobacter, Rhizobium, Bacillus, Devosia, Ohtaekwangia, Ramlibacter, Massilia, Steroidobacter, Phenylobacterium and Microvirga. Bacillus, Lysobacter, Rhizobium and Ohtaekwangia and all ten genera obviously increased under Y and YN100 treatments. These results indicate that combined application of corn straw and citric acid increased the PAH-degrading bacteria and PAH-RHDα genes, thus improving the biodegradability of PAHs in the soil. As these results verified, a combined corn straw-rhizosphere approach should be a feasible remediation strategy for PAHs-contaminated soil.

scholarly journals Effects of root exudates on the sorption of polycyclic aromatic hydrocarbons onto biochar

2019 ◽  
Vol 31 (1) ◽  
pp. 156-165 ◽  
Author(s):  
Xiaona Li ◽  
Yang Song ◽  
Yongrong Bian ◽  
Fang Wang ◽  
Chenggang Gu ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Root Exudates ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic

scholarly journals Response of Root Exudates of Bruguiera gymnorrhiza (L.) to Exposure of Polycyclic Aromatic Hydrocarbons

2022 ◽  
Vol 9 ◽  
Author(s):  
Beibei Liu ◽  
Lin Wu ◽  
Pan Pan ◽  
Ruilong Li ◽  
Bigui Lin
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Organic Acids ◽  
Root Exudates ◽  
Aromatic Hydrocarbons ◽  
Bruguiera Gymnorrhiza ◽  
Total Sugars ◽  
Mangrove Root ◽  
Degradation Rates ◽  
Hydroponic Cultivation ◽  
Polycyclic Aromatic

Root exudates play a pivotal role in the behaviors of polycyclic aromatic hydrocarbons (PAHs) in mangrove sediments, but the knowledge of how mangrove root exudates response to PAHs pollutants is limited. This study examined the root exudates of Bruguiera gymnorrhiza (L.) (B. gymnorrhiza) under exposure in phenanthrene, pyrene, and benzo[a]pyrene solution through a 45 days hydroponic cultivation. The results showed that the root exudates of B. gymnorrhiza were mainly hydrocarbon compounds. Tartaric acid was the dominant low molecular weight organic acids (LMWOAs) in root exudates. Under PAHs stress, the proportion of hydrocarbon compounds in root exudates decreased, while the proportion of amide compounds increased. At the first 15 days exposure, the amounts of dissolved organic carbon, soluble total sugars, total organic acids and LWMOAs all increased and reached the maximum values, subsequently, the amounts of root exudates had dropped. The degradation rates of PAHs followed the sequence of phenanthrene &gt; pyrene &gt; benzo [a] pyrene, and the presence of root exudates can significantly enhance the degradation of PAHs. The results illustrated that PAHs stress can significantly change the concentrations and species of root exudates. This study provides the scientific reference for understanding the ability of B. gymnorrhiza response to PAHs stress.

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